docs: def _update_from_standard_locations():
      ''' Check standard locations for config files and update settings if found.
      Order is user's home dir, environment variable ($PLIERS_CONFIG), and then
      current directory--with later files taking precedence over earlier ones.
      '''
      locs = [
          join(expanduser('~'), _config_name),
          join('.', _config_name)
      ]
      if 'PLIERS_CONFIG' in os.environ:
          locs.insert(1, os.environ['PLIERS_CONFIG'])
  
      from_file(locs, False)